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Htsep12pg07.Pdf hygienetown profile in oral health by Trisha E. O’Hehir, RDH, MS and Amy Francis, RDH, OM Abstract Nose breathing and mouth breathing both bring oxygen into the lungs but with different consequences and different oxygen absorption levels. Dental and den- tal hygiene education in the past touched only briefly on problems associated with mouth breathing, primarily dry, inflamed oral tissues around maxillary anterior teeth. There is now evidence that mouth breathing has far more serious and long-lasting implications than drying of oral tissues. A simple five-step screening process identifies factors affecting nasal breathing. Objectives At the end of this program, participants will be able to: 1. Understand physiologic differences between nasal breath- ing and mouth breathing. 2. Describe symptoms of mouth breathing. 3. Understand the impact of mouth breathing on malocclusion. 4. List the five steps in the mouth-breathing screening exam. 5. Recognize the role of RDHs in preventing mouth breathing. 7 SEPTEMBER 2012 » hygienetown.com hygienetown profile in oral health Humans are designed to be nose breathers, but for a variety Mouth Breathers are prone to: of reasons the switch can be made to mouth breathing, with seri- ous consequences. The nose and mouth have different func- tions. Each nostril functions independently and synergistically nasal congestion burping to filter, warm, moisturize, dehumidify and smell the air. It’s like watery, itchy eyes flatulence having two noses in one. Breathing through the mouth provides runny nose hiccups none of these benefits of nose breathing and a lengthy list of allergies acid reflux adverse effects. The problems associated with mouth breathing asthma heartburn begin in the mouth by changing the tongue rest position, thus enlarged tonsils poor palate development changing the normal growth pattern of the palate, both maxil- bad breath crooked teeth lary and mandibular jaws and the airway.1 Inadequate skeletal tonsil stones recessive chin growth leads to crowded teeth, a high-vaulted palate and abnor- dry cough Long Face Syndrome mal occlusion, called the Long Face Syndrome. In mouth snoring speech problems breathers, the tongue rests down and forward, not in the palate sleep disturbances weak, flaccid lips as it should, leading to tongue thrust, abnormal swallowing fatigue fibromyalgia low energy level chronic fatigue syndrome habits and speech problems. A significant problem with mouth ADHD silent aspiration breathing is reduced oxygen absorption leading to a cascade of tongue thrust pneumonia sleep, stamina, energy level and ADHD problems. Dryness of abnormal swallowing habits bronchitis the oral and pharyngeal tissues from mouth breathing leads to aerophagia bed wetting inflamed tonsils, tonsil stones, dry cough, swollen tongue, hali- bloating frequent urination at night tosis, gingivitis and caries. Mouth breathers chew with their mouths open, swallowing air, leading to gas, bloating, flatulence and burping. Lips become flaccid with mouth breathing because Physiology of Breathing they don’t close regularly to provide the necessary lip seal. The purpose of breathing is to deliver oxygen to the cells Dental and dental hygiene education in the past touched of the body and to remove excess carbon dioxide. The body only briefly on problems associated with mouth breathing, pri- requires approximately two to three percent oxygen and the marily dry, inflamed oral tissues around maxillary anterior teeth. atmospheric level is 21 percent so there is no need to store oxy- Adding to that knowledge, there is now evidence that mouth gen. The body’s requirement for carbon dioxide is 6.5 percent breathing has far more serious and long-lasting implications and the atmospheric content is 0.03 percent, so the body has to than drying of oral tissues. produce and store carbon dioxide in the lungs and blood. Many misconceptions about mouth breathing persist today. Carbon dioxide is produced as a byproduct of exercise and In some circles, mouth breathing and nose breathing are thought digestion of food. Carbon dioxide has several functions in the to be equivalent and in athletics, mouth breathing is still body: facilitate release of oxygen from hemoglobin, trigger assumed to be better than nose breathing. Assuming that mouth breathing, maintain blood pH by buffering with bicarbonate or breathing and nose breathing are no different ignores basic phys- carbonic acid and prevent smooth muscle spasms. All of these iologic facts about the exchange of oxygen and carbon dioxide. functions are reduced or impaired in mouth breathers. Today professional athletic teams are being coached to train with Breathing is subconscious with each inhale determined not their mouths closed, focusing on nose breathing to increase by the need for oxygen, but by the level of carbon dioxide in the endurance, stamina and muscle memory. Another misconcep- alveoli of the lungs and blood. As carbon dioxide builds up in tion is assuming more oxygen is absorbed with a big inhale the body, the pH of the blood drops. This pH change is moni- through the mouth doesn’t take into consideration the fact that tored by chemoreceptors in blood vessels that will signal the oxygen is absorbed on the exhale, not the inhale. Sleep medicine brain to trigger the next breath. Normal respiration follows a writings assume mouth breathing and sleep apnea are not con- gentle wave pattern with 10 to 12 breaths per minute, providing nected, which is not supported by scientific evidence. Mouth five to six liters of air per minute. Mouth breathers often have a breathing and obstructive sleep apnea (OSA) are connected.4 respiration rate above 12 breaths per minute and those with Dental professionals are in a perfect position to evaluate asthma and serious medical conditions have rates of 20 respira- mouth and nose breathing, check for tongue rest position and tions per minute or higher. intervene early with young children to assure normal skeletal Breathing through the nose controls the amount of air taken development and help mouth breathers of all ages become nose in and, more importantly, controls the amount of air exhaled. breathers. Understanding the physiology of breathing and implementing a simple five-step screening system raises aware- 1. Souki, B., Pimenta, G., et al: Prevalence of malocclusion among mouth breathing in children: do expec- tations meet reality? Int J Pediatr Otorhinolaryngol 73(5):767-773, 2009. ness of the significance of this problem and provides an oppor- 4. Juliano, M., Machado, M., et al: Polysomnographic findings are associated with cephalometric measure- tunity to implement far-reaching changes in patients’ lives. ments in mouth-breathing children. J Clin Sleep Med 15(5):554-561, 2009. continued on page 9 8 hygienetown.com « SEPTEMBER 2012 hygienetown profile in oral health continued from page 8 Oxygen is absorbed on the exhale, not on the inhale. The back- mouth. Others believe they are nose breathers, but if you watch pressure created in the lungs with the slower exhale of nose them, their mouth is open most of the time. Sitting still, they breathing compared to mouth breathing allows more time for might have their mouth closed, but if they get up and walk the lungs to transfer oxygen to the blood. The exchange of oxy- across the room, their mouth is open. Telltale signs of mouth gen in the blood requires the presence of carbon dioxide. breathing are an addiction to chap stick or lip balm. An open Approximately 98 percent of oxygen is carried in hemoglobin. mouth leads to drooling, both awake and asleep, causing Carbon dioxide levels need to be at five percent in the alveoli chapped lips and a tendency for mouth breathers to lick their and arterial blood before the oxygen molecules are released from lips frequently. Closed mouth lip seal is efficient at keeping hemoglobin to reach brain and muscle cells. Lower than five saliva in and air out but chronic mouth breathers find it very dif- percent carbon dioxide levels lead to an elevation in blood pH ficult to hold their lips together. Mouth breathing at night and the oxygen “sticks” to the hemoglobin, this is the Bohr causes drooling and dries the oral tissues so the mouth, teeth, Effect, first described in 1904 by physiologist Christian Bohr. tissue and throat are all dry upon waking. If someone wakes Nitric oxide is released in the nasal cavity and inhaled with with a dry mouth, he or she is likely a mouth breather at night, nose breathing. Nitric oxide increases the efficiency of oxygen which means he or she is also mouth breathing during the day. exchange. With nitric oxide, blood oxygen increases by 18 per- The tongue normally rests against the palate, without touch- cent. Mouth breathing bypasses the nitric oxide. ing the teeth. With mouth breathing, the tongue drops down Seventy-five percent of the inhaled oxygen is exhaled. and forward. It might in fact be that the down and forward During strenuous exercise, 25 percent of the oxygen inhaled is tongue position triggers mouth breathing. Mouth breathing is exhaled. Mouth breathing to take in more air does not increase impossible with the tongue resting against the palate. A simple the level of oxygen in the blood, which is already 97-98 percent tool to self-test for mouth breathing is the square plastic bag saturated. Mouth breathing with big breaths actually lowers the closers used on plastic bread bags. Place the square plastic chip carbon dioxide level in the lungs and the blood leading to lower between the lips and have the person go about their daily activ- levels of oxygen released from the hemoglobin to body cells. ities. If the chip falls out, they are mouth breathing. Taking in more air doesn’t deliver more oxygen to the cells of the body. A balanced pH of the blood is achieved with proper oxy- Mouth Breathing – What Goes Wrong gen-carbon dioxide exchange.
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